New Implementation of Hide and Seek Project 21 Presentation By Ken Fester & Jesse D. Crowe Ece 445 – Spring 2017 Ta: Sam Sagan

Introduction Hide and seek with a twist (similar to the on-campus “humans vs. zombies” game). New Ideas Each player gets an electronic device. The seeker gets visual feedback based on proximity to the hider using a directional antenna. The hider gets tactile feedback when the seeker is getting close. Instead of physically tagging the hider, the seeker “tags” the hider using an IR LED.

Objective Same game everyone knows and loves, with a new and exciting way to play. Caters to a large variety from kids in middle school to young adults on college campuses. Other applications include self-guided tours, point-of-interest notification, and advertising.

Physical Design Seeker Device Hider Device LED’s Signal Direction 100% 0% LED’s Signal Direction Seeker Device Strap/Clip Antenna Hider Device Figure 1: Physical design of seeker device (left) and hider device (right).

High-Level Requirements Notify users when the target is in their field of view. Send and receive data over an IR channel. Communicate with users via LED’s, Bluetooth, and tactile feedback.

High-Level Block Diagram Figure 2: High-level block diagram of hider and seeker system.

IR Receiver/transmitter Testing Required range of use from 1 m – 10 m +/- 20%. This meant powering IR LED to continually pulse a consistent signal. Probing the IR receiver’s output pin. Verify transmitted packet of information matched the received packet of information.

IR Receiver/transmitter testing Results Figure 3: Results of IR communication testing.

Figure 4: LED Driver Schematic. LED Control LED driver must run each LED independently. Figure 4: LED Driver Schematic. Figure 5: LED Schematic.

LED Visibility Testing LED’s must be visible in 110,000 lux or greater (sunny day). Bring device outside in these conditions. Light up variety of LED patterns then have a user verify the pattern of illuminated LEDs. Test was successful.

Vibration Feedback Testing Motor must output two different vibration patterns. Pattern 1 – Quick pulsing buzz (Targeted). Pattern 2 – Long continuous buzz (Tagged). User must be able to distinguish between the two buzzing patterns while device attached to backpack strap.

Vibration Circuit Schematic Figure 6: Vibration motor and driver schematic.

Bluetooth communication Bluetooth module must be able to create an open network which can connect and communicate with other Bluetooth devices. Modular testing: USB to serial conversion to communicate with computer interface. Use IPhone app “SmartData” to connect and transfer information. Integration with device and phone application for future improvement.

Wi-Fi Module Wanted connection between Wi-Fi modules to range from 0 – 60 m +/- 10%. Design Obstacles: Reset pin left floating – found out this needed to be pulled high for programming. Difficult solder package – improve by using reflow soldering oven and stencil.

Figure 7: Wi-Fi module schematic.

Omni-Directional Antenna Connected to Wi-Fi module to gather idea of omnidirectional beam pattern and gain. Obtained consistent readings of -30 dBm at about a distance of 8 m radially.

Directional Antenna Main objective: Beam solid angle less than or equal to 2.75 sr (approximately a human’s field of view). Physically small enough for a user to easily hold and carry (150 x 80 mm). Single main lobe with no side lobes greater than -3 dB.

Directional Antenna Physical Design Figure 8: Physical design of directional 4-patch array.

Directional Antenna Simulated Beam Pattern Figure 9: Simulated beam pattern of directional antenna 4-patch array.

Directional Antenna Physical Design Figure 10: Physical design of directional 2-patch array.

Directional Antenna Simulated Beam Pattern Figure 11: Simulated beam pattern of directional antenna 2-patch array (2 angles).

Simulated Antenna parameters Figure 12: Simulated parameters for 2-patch array directional antenna.

Directional Antenna Testing Formal testing would occur in an anechoic chamber for gain and beam pattern. We created a Wi-Fi hotspot with a phone and connected to the network with our seeker device while… Orienting antenna in different ways. Reading RSSI values from network connection Gather understanding of gain and beam pattern at a constant distance of about 8 m. Wi-Fi module functionality limited application testing for this component.

Microcontroller Must communicate with the following modules LED driver – Control when and how LEDs light up based on Wi-Fi RSSI value. Wi-Fi module – Parse and receive RSSI value inputs. IR receiver – Connect to output pin to check if IR LED signal is received. IR LED transmitter – Continually drive IR signal. Vibration motor driver – Drive vibration motor based on IR receiver output pin. Design Obstacles Arduino environment compatibility. I2C second bus not available in Arduino library.

What’s next? Make ready for commercialization. Make improvements/changes where previously stated (microcontroller, Wi-Fi, further functionality testing). Need to be battery powered rechargeable devices. All users should have option to be hider or seeker for massive user integration. Create phone app to play with friends and randomly assign seeker. Physical design should be implemented.

Thank You Could not have done this without the help from Our TA, Sam Sagan All the Sr. Design staff that contributed to our success ECE department whose courses gave us a foundation for our design decisions